Power-transmission pulley.



C. S.. BERGQUIST.

POWER TRANSMISSION PULLEY.

APPLlCATION FILED FEB. 15. 1911.

Patented Aug. 28, 1917.

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POWER TRANSMISSION PULLEY APPLICATION FI LE D FEB. 15. 1917". 1,%38,62'7, Patented Aug. 28, 1917.

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POWER-TRANSMISSION PULLEY.

Specification Letters Patent.

Patented Aug. 28, 191%.

Application filed February 15, 1917. Serial No. 1%,?57.

To all whom it may concern Be it known that I, CLARENCE S. BERG- pIs'r, a subject of the King of Great Britam and Ireland and a resident of Seattle, in the county ofKing and State of Washington, have invented a certain new and use: ful' Improvement in Power-Transmission Pulleys, of which the following is a specification. 7

The present invention relates to power transmission mechanism, and more particularly to pulleys and the like over which are adapted to be trained flexible connecting elements.

An object of the present invention is to provide a pulley of this character which is adapted to receive thereover a cable, a chain, a belt, orthe like flexible connecting ele ment, and. which is of such construction as to increase the traction between the pulley and the flexible element to adapt the pulley to use where heavy loads are to be carried at a relatively slow rate of speed.

Another object of the present invention is to provide a pulley possessing the above characteristics, and which is of such construction that the same may be made relatively small with a relatively large traction or friction surface.

It is a further aim of the present invention to provide a pulley of this nature which comprises relatively few parts, which is strong and durable, and which may be economically manufactured.

The above, and various other objects and advantages of this invention will be in part understood, and in part described,-in the following detailed description of the present preferred embodiment, the same being illustrated in the accompanying drawings wherein:

Figure, 1 is a side elevation of a pulley constructed according to the present invention.

Fig. 2 is a top plan View of the pulley having a cable applied thereto. i

Fig. 3 is a transverse section of the sam taken substantially centrally and at right angles to the axis of rotation of the pulley.

Fig. 1 is a transverse section on the line H o g- 3, sh win th n t n b tween the circumferentially arranged peripheral elements and the centrally disposed actuating means therefor.

Fig, 5 is a detail enlarged section on the line 55 of Fig. 3 showing the connection between the spider and the adjacent ends of a pair of the spindles.

Fig. 6 is a detail, enlarged, peripheral view of the same, the remote parts being broken away.

Referring to these drawings, wherein like parts are designated by similar characters of reference throughout the several views, 10rlesignates a base of suitable form provided with transversely spaced-apart uprights 11 and 12. The uprights 11 and 12 are provided upon their upper ends with alining bearings 13 and 14:, the latter of which support a rigid stud or arm 15 which projects inwardly toward the opposite bearing 13. The arm 15 carries upon its inner end a relatively large stationary worm 16, the thread of which recedes from the standard or post 12 and extends in a left-hand direction.

A shaft '17 is journaled through the hearing 13 and may have its inner end journaled in the central portion of the worm 16, at the free side thereof. Keyed to the shaft 17 is a spider 18 in the form of a hub portion provided with radially extending arms, the

outer ends of which extend transversely and overlie the periphery of the worm 16. The arms of the spider may be of any desired number, and carry upon their outer ends a circumferential row of spindles 19. A spindle 19 is arranged between each two of the arms, and the spindles are oppositely reduced in thickness at their meeting ends and overlapped. Bolts 20 or the like are carried upon the outer ends of the arms of the spider 18 and engage through the overlapping ends of the spindles 19 to securely and rigidly hold the same upon the spider.

Each spindle 19 has freely mounted thereon a roller 21 provided in its periphery with equi-distantly spaced-apart grooves 22 which extend longitudinally of the rollers, and which .are adapted to engage the thread of the worm 16. Preferably, the periphery of the roller 21 is tapered longitudinally, or reduced at its opposite ends by tapering the same, to conform the peripheries of the circumferential row of the rollers 21 to a circle toward the top of the pulley, as shown inconcentric with the aXis of the pulley. Washers or collars 23 are mounted on the spindles l9 and are held against the opposite ends of the rollers 21 by'pins 24: or the like for centering the rollers 21 between each 1. 'In 'a pulley, the combination of a plurality ,of peripherally disposed belt-engagpair of the arms of the spider 18.

The flexible connecting or driving element A being shown in the present instance as in the form of a steel cable which is wound with one or more turns about the pulleys,

and seated in the registering grooves 22 ot the rollers 21. By providing the rollers 21.

with. a plurality of grooves, increased traction or friction is eiiected between the .pul-

leys and the flexible element A. V

In operation, when the cable A moves Fig. 3, it enters the registering grooves 22 in the rollers 21, and as the cable A is car ried about the pulleys to the bottom thereof, the stationary worm 16 rotates the rollers 21 to advance the cable at the bottom of the pulleys transversely of the peripheries thereof a distance equal to one-hallthe distance between adjacent grooves 22 in the rollers.

. \Vhen the cable again reaches the top of the pulleys, the worm 16 has turned .the rollers 21 sufficiently to space the cable laterally a distance equal to the distance between adjacent grooves of the rollers 21 so that the a pulley is in position for receiving, constantly, the cable A as the latter is moved toward the pulley. In a like manner, as the cable may again be carried to the bottom of the pulley, it is displaced laterally one-half the distance between adjacent grooves of the rollers and may be taken off at" that point, as shown in the'drawlngs, or may be continued around the pulley any number of turns.

As the rollers 21 are constantly in contact I with the stationary worm 16, the rollers are The thread of the worm 16 extends in such a direction as to turn the rollers 21 to'ad- Vance the cable A laterally from the point at which the cable first engagesthe pulley.

A pulley of this construction retains the cable A thereon and prevents the cable from sliding oil the pulley; provides a relatively large friction or traction surface for engagement with the cable A; is provided with means'for positively and accurately turning the peripheral or movable members, soas toadvance the cable laterally as it is fed about the pulley; and provides a pulley about which the cable A may be wound one or more times as desired.

It is, of course understood that various changes and modlficatlons may be made in the details of construction of the abovespecifically described embodiment of this invention without departing from the spirit thereof, and being restricted only' loy the scope of the following claims. I

I claim:' i

ing members, and means for actuating said members to move the belt transversely of thepulley. V I

' 2. In a'pulley, the combinationof a ClI'G111I1-.L .fereiitial row of movable elements adapted for'engagement with a belt, and means for moving said elements to move the belttransversely pulley.

3. In a o r, h rer l ral ur ace o t pulleypthe amov able part, a plurality ofbelt engagingmem; l 5, bers mounted in the periphery oi" themovable part, anda Stationary partengaging said movable members for actuating the' same upon the turning of the movable part to advance the belt.transversely. -acrossthe peripheral surface otthe pulleyftf 1. In a pulley, thecombination of a fixed worm wheel, a spider rotatablyfmounted' at 5, one side of the worm wheel, a plurality of rollers carried by the spider and. arranged circumferentially about. said worm wheel,;-

said rollers being provided with longitudi- T nal grooves therem adapted to meshw -th said wormiwheel, whereby said rollerslare; adapted to be turnedby'the. worm wheel 5 upon the rotationof the spider; 1 l

5. In a pulley, the com ination er w s worm wheel, a rotating spider arranged aa- I jacent to the worm wheelfa pluralityof rollers mounted on'th'e 'spider'andarran'ged circumferentially around the wormiwheel,"

said rollers having longitudinal grooves.

therein'fadap'ted to mesh with. the "worm" wheel and adapted to receivea belt, said belt 1 being adapted to :be actuated to. turn said rollers'an'd spider, and said worm wheel bemg adapted to turn said rollers uponthe' spider to move the belttransversely' of the pulley;

worm'wlieel, a spider rotatably mounted concentric with the worm wheel, said spiderl extending spaced-apart Iarms, spindles see.

6. In a pulley, the'combinationof a 7 cured across j the fouter ends of said arms,'

rollers mounted to turn on said spindles. and arranged in a clrcumferentlal row. about said worm wheel, said. rollers being pro:

vided with longitudinally extending grooves".

adapted to receive therein a cable atthe pe riphery of the pulley and adapted tomesh with said worm"'wheel, saidflcable being adapted to turn the spider, and saidworm wheel being adapted to turn said rollers to advance the cable; laterally as it passes around the pulley. V

7 In'a pulley, the

combination of a fixed Worm Wheel, a shaft rotatably mounted concentric With the Worm Wheel, a spider fixed upon said shaft and having radially extending arms, a plurality of spindles carried by said arms in the plane of the Worm wheel,

and a plurality of rollers mounted on said spindles and having longitudinal grooves therein engaging the Worm Wheel, said roll- CLARENCE S. BERGQUIST.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C." 

